S
M
T
W
T
F
S
26
88°
71°
27
89°
71°
28
88°
70°
29
88°
71°
30
89°
72°
31
90°
71°
1
89°
70°
2
84°
69°
3
83°
66°
4
81°
68°
5
81°
66°
6
82°
65°
7
83°
68°
8
84°
69°
9
86°
70°
10
88°
70°
11
87°
69°
12
84°
69°
13
87°
70°
14
88°
69°
15
84°
70°
16
82°
69°
17
85°
70°
18
88°
70°
19
87°
69°
20
87°
63°
21
86°
61°
22
81°
61°
23
81°
62°
24
82°
63°
25
82°
62°
26
83°
67°
27
84°
62°
28
82°
61°
29
81°
61°
30
80°
60°
31
79°
59°
1
79°
60°
2
80°
61°
3
78°
64°
4
79°
60°
5
81°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Charlestown
Charlestown's August 2026 forecast shows daily high temperatures ranging from 78° to 90°, with overnight lows between 59° and 72°. The average high for August is 84° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Charlestown. See also: September | October | November.
